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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e0ee05c60d5adec6bd9119c3122f81cd0cf86eb5db3a8c69f6fdf5d69e882e' 
  AND token = 'htkW+pUD9NvuWNrquzlfpkpExCjV4vOgt0y26a2E6/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}